Crystal morphology and xrd peculiarities of brazilianite from different localities.
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Publication Date: | 2011 |
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Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFOP |
Download full: | http://www.repositorio.ufop.br/handle/123456789/4140 |
Summary: | Forty four brazilianite crystals from several localities in Brazil, Rwanda and Canada were measured on a two-circle goniometer to determine brazilianite morphology. Twenty forms were recorded; six of them have not been recorded before. All faces in the [001] zone are striated along crystallographic axis c. All striated forms in the [001] zone exhibit multiple signals. Two of the signals observed on the form {110} are always very clear. There is an exception on one crystal where just one face, (110), exhibits only one clear signal. Five groups of habits were recorded, two of them new to this mineral species. Eleven samples were examined by X-ray diffraction for calculation of the unit cell parameters yielding a=11.201(1)–11.255(2) Å, b=10.1415(5)–10.155(1) Å, c=7.0885(7)–7.119(2) Å and b=97.431(7)–97.34(1) °. All X-ray diffraction patterns show a peculiarity: some diffraction lines are widened or doubled with the appearance of additional diffraction lines systematically on lower °2Q. These diffraction lines have smaller intensities and cannot be indexed in accordance with brazilianite crystal structure. |
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Čobić, AndreaZebec, VladimirCipriano, Ricardo Augusto ScholzBermanec, VladimirBarreto, Sandra de Brito2014-12-11T16:40:51Z2014-12-11T16:40:51Z2011ČOBIĆ, A. et al. Crystal morphology and xrd peculiarities of brazilianite from different localities. Natura Croatica, v. 20, p. 1-18, 2011. Disponível em: <http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=104073&lang=en>. Acesso em: 07 out. 2014.1848-7386http://www.repositorio.ufop.br/handle/123456789/4140Forty four brazilianite crystals from several localities in Brazil, Rwanda and Canada were measured on a two-circle goniometer to determine brazilianite morphology. Twenty forms were recorded; six of them have not been recorded before. All faces in the [001] zone are striated along crystallographic axis c. All striated forms in the [001] zone exhibit multiple signals. Two of the signals observed on the form {110} are always very clear. There is an exception on one crystal where just one face, (110), exhibits only one clear signal. Five groups of habits were recorded, two of them new to this mineral species. Eleven samples were examined by X-ray diffraction for calculation of the unit cell parameters yielding a=11.201(1)–11.255(2) Å, b=10.1415(5)–10.155(1) Å, c=7.0885(7)–7.119(2) Å and b=97.431(7)–97.34(1) °. All X-ray diffraction patterns show a peculiarity: some diffraction lines are widened or doubled with the appearance of additional diffraction lines systematically on lower °2Q. These diffraction lines have smaller intensities and cannot be indexed in accordance with brazilianite crystal structure.Morfologia - mineraisMorphology - mineralsCrystalCrystal morphology and xrd peculiarities of brazilianite from different localities.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleFull-text papers plubished in Natura Croatica can be used for personal or educational purposes only. Authors' and publisher's copyrights must be acknowledged. Fonte: Natura Croatica <http://hrcak.srce.hr/natura-croatica>. Acesso em: 08 out. 2014.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-82636http://www.repositorio.ufop.br/bitstream/123456789/4140/2/license.txtc2ffdd99e58acf69202dff00d361f23aMD52ORIGINALARTIGO_CrystalMorphologyXRD.pdfARTIGO_CrystalMorphologyXRD.pdfapplication/pdf443104http://www.repositorio.ufop.br/bitstream/123456789/4140/1/ARTIGO_CrystalMorphologyXRD.pdfa4c8c99d8489302c5cd8e312efaa3431MD51123456789/41402019-05-16 10:14:31.272oai:localhost:123456789/4140Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-05-16T14:14:31Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
title |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
spellingShingle |
Crystal morphology and xrd peculiarities of brazilianite from different localities. Čobić, Andrea Morfologia - minerais Morphology - minerals Crystal |
title_short |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
title_full |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
title_fullStr |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
title_full_unstemmed |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
title_sort |
Crystal morphology and xrd peculiarities of brazilianite from different localities. |
author |
Čobić, Andrea |
author_facet |
Čobić, Andrea Zebec, Vladimir Cipriano, Ricardo Augusto Scholz Bermanec, Vladimir Barreto, Sandra de Brito |
author_role |
author |
author2 |
Zebec, Vladimir Cipriano, Ricardo Augusto Scholz Bermanec, Vladimir Barreto, Sandra de Brito |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Čobić, Andrea Zebec, Vladimir Cipriano, Ricardo Augusto Scholz Bermanec, Vladimir Barreto, Sandra de Brito |
dc.subject.por.fl_str_mv |
Morfologia - minerais Morphology - minerals Crystal |
topic |
Morfologia - minerais Morphology - minerals Crystal |
description |
Forty four brazilianite crystals from several localities in Brazil, Rwanda and Canada were measured on a two-circle goniometer to determine brazilianite morphology. Twenty forms were recorded; six of them have not been recorded before. All faces in the [001] zone are striated along crystallographic axis c. All striated forms in the [001] zone exhibit multiple signals. Two of the signals observed on the form {110} are always very clear. There is an exception on one crystal where just one face, (110), exhibits only one clear signal. Five groups of habits were recorded, two of them new to this mineral species. Eleven samples were examined by X-ray diffraction for calculation of the unit cell parameters yielding a=11.201(1)–11.255(2) Å, b=10.1415(5)–10.155(1) Å, c=7.0885(7)–7.119(2) Å and b=97.431(7)–97.34(1) °. All X-ray diffraction patterns show a peculiarity: some diffraction lines are widened or doubled with the appearance of additional diffraction lines systematically on lower °2Q. These diffraction lines have smaller intensities and cannot be indexed in accordance with brazilianite crystal structure. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011 |
dc.date.accessioned.fl_str_mv |
2014-12-11T16:40:51Z |
dc.date.available.fl_str_mv |
2014-12-11T16:40:51Z |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
ČOBIĆ, A. et al. Crystal morphology and xrd peculiarities of brazilianite from different localities. Natura Croatica, v. 20, p. 1-18, 2011. Disponível em: <http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=104073&lang=en>. Acesso em: 07 out. 2014. |
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http://www.repositorio.ufop.br/handle/123456789/4140 |
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1848-7386 |
identifier_str_mv |
ČOBIĆ, A. et al. Crystal morphology and xrd peculiarities of brazilianite from different localities. Natura Croatica, v. 20, p. 1-18, 2011. Disponível em: <http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=104073&lang=en>. Acesso em: 07 out. 2014. 1848-7386 |
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